OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPB036060ABAA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1PPB036060ABAA packaged rooftop unit. As the brain of your system's heating sequence, this integrated control board manages spark ignition, gas valve activation, combustion blower and indoor fan motors, flame sensing, and safety lockout — all in a single microprocessor-driven module. When this board fails, common symptoms include a no-heat condition, repeated ignition lockout faults, short-cycling, or a system that sparks but never establishes a stable flame.

• Specs: Direct Spark Ignition (DSI) integrated control board | Manages combustion, blower, and indoor fan motor sequencing | Onboard flame sensing and trial-for-ignition timing | Microprocessor-based with LED fault code diagnostics for faster troubleshooting
• OEM vs Generic: This is a genuine Carrier OEM board built to exact factory specifications. Aftermarket substitutes may omit proprietary timing sequences or safety interlocks unique to Carrier rooftop units, risking nuisance lockouts or voided equipment warranties.
• Install difficulty: 3/5 — Disconnect all power and gas before servicing. Photograph all wiring harness connections and terminal labels before removing the old board. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 24V control circuit is intact before powering up. Recommended for qualified HVAC technicians.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse — get your unit back online fast.

Compatibility: Designed for the Carrier PY1PPB036060ABAA packaged rooftop unit. Also fits select Carrier, Bryant, and ICP commercial rooftop platforms that use the LH33WP003 DSI control board — confirm your unit's existing part number against your data plate before ordering. Not sure it fits? Contact our HVAC parts team for free fitment verification before you buy.